Evaluate the Ratio for a Carbonoxygen White Dwarf With M 07m and Again

The SN Ia runaway LP 398-9: detection of circumstellar material and surface rotation

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Vedant Chandra,

Middle for Astrophysics ∣ Harvard & Smithsonian

, 60 Garden St, Cambridge, MA 02138,

Us

Department of Physics & Astronomy, Johns Hopkins University

, 3400 N Charles St, Baltimore, Physician 21218,

U.s.

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Hsiang-Chih Hwang,

Department of Physics & Astronomy, Johns Hopkins University

, 3400 Due north Charles St, Baltimore, MD 21218,

USA

Institute for Avant-garde Study

, Einstein Bulldoze, Princeton, NJ 08540,

U.s.a.

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Nadia L Zakamska,

Department of Physics & Astronomy, Johns Hopkins University

, 3400 N Charles St, Baltimore, Physician 21218,

Usa

Institute for Advanced Written report

, Einstein Drive, Princeton, NJ 08540,

United states

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Simon Blouin,

Los Alamos National Laboratory

, PO Box 1663, Los Alamos, NM 87545,

USA

Department of Physics and Astronomy, University of Victoria

, Victoria, BC V8W 2Y2,

Canada

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Andrew Swan,

Department of Physics & Astronomy, University College London

, Gower Street, London WC1E 6BT,

United kingdom of great britain and northern ireland

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Thomas R Marsh,

Department of Physics, University of Warwick

, Coventry, CV4 7AL,

United kingdom

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Ken J Shen,

Department of Astronomy and Theoretical Astrophysics Heart, Academy of California

, Berkeley, CA 94720,

USA

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Boris T Gänsicke,

Section of Physics, University of Warwick

, Coventry, CV4 7AL,

Britain

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J J Hermes,

Section of Astronomy & Plant for Astrophysical Research, Boston University

, 725 Commonwealth Ave., Boston, MA 02215,

USA

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Odelia Putterman,

Department of Astronomy & Found for Astrophysical Inquiry, Boston University

, 725 Republic Ave., Boston, MA 02215,

USA

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Received:

12 October 2021

Revision received:

24 March 2022

Abstract

A promising progenitor scenario for Type Ia supernovae (SNeIa) is the thermonuclear detonation of a white dwarf in a close binary system with another white dwarf. After the primary star explodes, the surviving donor tin can be spontaneously released as a hypervelocity runaway. Ane such runaway donor candidate is LP 398-9, whose orbital trajectory traces back ≈x⁵ yr to a known supernova remnant. Here, we report the discovery of carbon-rich circumstellar fabric around LP 398-9, revealed past a strong infrared excess and analysed with follow-upwardly spectroscopy. The circumstellar cloth is well-nigh plausibly equanimous of inflated layers from the star itself, mechanically and radioactively heated past the past companion's supernova. We also discover a 15.4 h periodic bespeak in the UV and optical light curves of LP 398-nine, which we translate as surface rotation. The rotation rate is consistent with theoretical predictions from this supernova mechanism, and the brightness variations could originate from surface inhomogeneity deposited by the supernova itself. Our observations strengthen the case for this double-degenerate SNIa progenitor channel, and motivate the search for more runaway SNIa donors.

© 2022 The Author(south) Published by Oxford Academy Printing on behalf of Purple Astronomical Order

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Source: https://academic.oup.com/mnras/article/512/4/6122/6567861

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